[PATCH] Add more ChangeTo* functions to MachineOperand

[hfinkel at anl.gov]

================
Comment at: include/llvm/CodeGen/MachineOperand.h:558
@@ +557,3 @@
+  /// ChangeToES - Replace this operand with a new external symbol operand.
+  void ChangeToES(const char *SymName, unsigned char TargetFlags = 0);
+
----------------
Please write out ChangeToExternalSymbol

http://reviews.llvm.org/D9505

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